\begin{table}[H]
\centering\centering
\caption{\label{tab: estimation - supply - within}Nested model - substitution elasticity between commodities (within-nest).}
\centering
\begin{tabular}[t]{lcccc}
\toprule
  & OLS & IV & OLS  & IV \\
\midrule
$\frac{\theta}{\lambda}$ & 0.201*** & 2.220*** & 0.164*** & 2.219***\\
 & (0.034) & (0.144) & (0.035) & (0.143)\\
$\frac{\theta}{\lambda}$ $\times$ frontier region &  &  & 0.725*** & -1.106***\\
 &  &  & (0.123) & (0.180)\\
\midrule
Time FE & $\checkmark$ & $\checkmark$ & $\checkmark$ & $\checkmark$\\
Location FE & $\checkmark$ & $\checkmark$ & $\checkmark$ & $\checkmark$\\
Observations & 7008 & 7008 & 7008 & 7008\\
KP-Wald First stage F-statistic &  & 171.2 &  & 176.6\\
\bottomrule
\end{tabular}
\end{table}
